US6181672B1 - Recording medium and a recording system for the recording medium - Google Patents

Recording medium and a recording system for the recording medium Download PDF

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Publication number
US6181672B1
US6181672B1 US09/419,908 US41990899A US6181672B1 US 6181672 B1 US6181672 B1 US 6181672B1 US 41990899 A US41990899 A US 41990899A US 6181672 B1 US6181672 B1 US 6181672B1
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United States
Prior art keywords
land
groove
grooves
substrate
prepit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09/419,908
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English (en)
Inventor
Eiji Muramatsu
Masahiro Kato
Makoto Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
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Pioneer Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Assigned to PIONEER CORPORATION reassignment PIONEER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, MASAHIRO, MURAMATSU, EIJI, SATO, MAKOTO
Priority to US09/758,393 priority Critical patent/US6493313B2/en
Application granted granted Critical
Publication of US6181672B1 publication Critical patent/US6181672B1/en
Priority to US10/274,199 priority patent/US6952393B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/24—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • G11B7/0053—Reproducing non-user data, e.g. wobbled address, prepits, BCA
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00718—Groove and land recording, i.e. user data recorded both in the grooves and on the lands
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24073—Tracks
    • G11B7/24079—Width or depth
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • G11B2220/216—Rewritable discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • G11B2220/218—Write-once discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs

Definitions

  • the present invention relates to a recording medium and a recording and reproducing system for the recording medium.
  • DVD digital versatile disc
  • DVD-R DVD WRITE ONCE
  • DVD-RW DVD-Re-Writable
  • the DVD-R or DVD-RW (hereinafter called DVD) has a spiral or co-axial groove for recording information, a land between the grooves and a plurality of land prepits formed between the grooves.
  • the land prepit is provided with various sets of information such as the address.
  • An object of the present invention is to provide a recording medium wherein information recorded on the groove and the land prepit can be accurately read out and a system capable of recording and reproducing with accuracy.
  • a recording medium having a circular substrate, grooves formed on the substrate, a land formed between the grooves, a plurality of land prepits formed between the grooves, wherein the groove and the land prepit are formed so as to satisfy a following formula,
  • Gw is the width of the groove
  • Lp is the length of the land prepit in a radial direction of the substrate
  • Gd is the depth of the groove
  • ⁇ is the wave length of light used in a system for recording information on the recording medium
  • NA is the numerical aperture of an objective in the system.
  • the present invention further provides a recording medium having a circular substrate, grooves formed on the substrate, a land formed between the grooves, a plurality of land prepits formed between the grooves, wherein the groove and the land prepit are formed so as to satisfy following formulae;
  • Gw is the width of the groove
  • Lp is the length of the land prepit in a radial direction of the substrate
  • Gd is the depth of the groove
  • ⁇ is the wave length of light used in a system for recording information on the recording medium
  • NA is the numerical aperture of an objective in the system.
  • the present invention still further provides a system of recording a medium having a circular substrate, grooves formed on the substrate, a land formed between the grooves, a plurality of land prepits formed between the grooves, wherein a wavelength of light for recording information on the medium and a numerical aperture of an objective of the system are provided so as to satisfy following formulae,
  • Gw is the width of the groove
  • Lp is the length of the land prepit in a radial direction of the substrate
  • Gd is the depth of the groove
  • FIG. 1 a is a perspective view of an optical DVD for explaining the present invention
  • FIG. 1 b is a sectional view of the disc of FIG. 1 a;
  • FIG. 2 a is an enlarged plan view showing a part of the disc
  • FIG. 2 b is a block diagram of a reproducing system
  • FIGS. 3 a through 3 c are graphs showing waveforms of a land prepit detection signal and an RF signal
  • FIGS. 4 a through 4 c are graphs showing waveforms of a land prepit detection signal and an RF signal detected from recorded mediums.
  • FIGS. 5 through 13 are graphs for determining optimum conditions for the land prepit are the groove of the medium.
  • the DVD has a transparent plastic substrate 4 made of polycarbonate.
  • a transparent plastic substrate 4 made of polycarbonate.
  • On the substrate 4 there is formed grooves 1 arranged in the circumferential direction DC, lands 2 between the grooves 1 , and land prepits 3 on the land 2 formed at predetermined intervals.
  • Information such as video data or audio data is recorded in the groove, and information such as address is recorded in the prepit.
  • a recording layer 5 of organic coloring matter or inorganic metal On the underside of the substrate 4 , there is formed a recording layer 5 of organic coloring matter or inorganic metal, a reflection layer 6 and a protecting layer 7 .
  • the laser light is applied to the groove passing through an objective 8 .
  • the width Gw of the groove 1 , the length Lp of the land prepit in the circumferential direction, and the depth Gd of the groove are determined to particular values as described hereinafter.
  • a light spot SP has a diameter larger than the width Gw of the groove 1 and disposed so that the center of the spot coincides with the center line of the groove 1 .
  • information recorded on the land prepit 3 can also be read as shown in FIG. 2 a.
  • the reproducing system has a photodetector 9 comprising four elements 9 A, 9 B, 9 C and 9 D for receiving the light reflected from the disc, and adding and subtracting circuits 10 and 11 and an adder 12 .
  • the spot of the reflected light is positioned such that the center of the spot coincides with the center of the photodetector 9 .
  • the areas A and D in FIG. 2 a read the information on the groove 1
  • areas B and C read information on the groove 1 and land prepit 3 .
  • the photodetector 9 produces signals A, B, C and D corresponding to the areas A-D.
  • FIGS. 3 a , 3 b , 3 c show results of reproduction experiments of the DVD-RW, where amplitude change of the land prepit signal SLp and the RF signal SRF under the condition that the wavelength ⁇ of the spot SP and the numerical aperture NA are constant.
  • the prepit length Lp is 0.3 ⁇ m and the groove width Gw is 0.25 ⁇ m
  • the prepit length Lp is 0.3 ⁇ m
  • the groove width Gw is 0.3 ⁇ m
  • Lp 0.3 ⁇ m
  • Gw 0.4 ⁇ m.
  • FIGS. 4 a , 4 b and 4 c show results of experiments of the DVD-RW in which information is recorded in the groove. The conditions are the same as those of FIGS. 3 a - 3 c.
  • the groove width Gw, the prepit length Lp and the groove depth Gp are determined to optimum values as follows.
  • the groove width Gw, prepit length Lp, groove depth Gd, numerical aperture NA and wavelength ⁇ are determined so that the ratio Gw/( ⁇ /NA) of the groove width Gw to spot diameter ⁇ /NA is set to satisfy both of following formulae (1) and (2).
  • the ratio ⁇ /NA of the wavelength ⁇ to the numerical aperture NA indicates a diameter d of spot SP.
  • An optimum design of the DVD can be obtained by satisfying the above conditions. Namely, it is possible to detect the RF signal SRE and prepit signal SLp with high accuracy, even if the spot irradiates the groove and prepit.
  • FIGS. 5-8 show results of experiments wherein detection accuracy of the land prepit signal SRF changes with the groove width Gw, prepit length Lp, groove depth Gd, wavelength ⁇ and numerical aperture NA.
  • the abscissa is the ratio Gw/( ⁇ /NA) of diameter ⁇ /NA to the groove width Gw
  • the ordinate is the ratio LPP level/offset of the voltage amplitude of the land prepit signal SLp (LPP level) to the offset level (off set) of the RF signal SRF.
  • the groove depth Gd and the prepit length Lp are changed.
  • the offset level is a parameter obtained by standardizing the alternating current component of the RF signal SRF of FIGS. 3 a - 3 c with the direct current component of the signal SRF
  • the voltage amplitude (LPP level) is a parameter obtained by standardizing the land prepit signal SLp with the direct current component of the RF signal SRF.
  • the offset level is expressed by the following formula (3)
  • voltage amplitude is expressed by the formula (4)
  • the ratio is expressed by the formula (5).
  • the groove depth Gd is changed between 20 ⁇ m-35 ⁇ m by 5 ⁇ m.
  • Lp/( ⁇ /NA) 0.128
  • Lp/( ⁇ /NA) 0.2515 in FIG. 6, 0.3815 in FIG. 7, 0.505 in FIG. 8 .
  • FIGS. 9-12 show the relationship between Lp/( ⁇ /NA) and Gw/( ⁇ /NA) with the parameter of the groove depth Gd.
  • the line Gwo in FIGS. 9-12 is a line obtained by plotting points where the value of LPP level/offset in FIGS. 5-8 becomes maximum, and the line G+ and line G ⁇ are lines obtained by plotting points where LPP level/offset becomes about 10. Further, the line G+ is the case where LPP level/off set becomes 10 in the right side of FIGS. 5-8, the line G ⁇ is the case where LPP level/offset becomes 10 in the left side of FIGS. 5-8.
  • the formula (6) shows the most optimum condition.
  • the lines G+ and G ⁇ is approximately equal to lines formed by parallely moving the line Gwo.
  • FIG. 13 shows the relationship between the groove depth Gd and Gw+/( ⁇ /NA) and the relationship between the groove depth Gd and Gw ⁇ /( ⁇ /NA) in which the parallel moving quantities are set to the ranges Gw+ and Gw ⁇ .
  • the range between the lines Gw+ and Gw ⁇ is the optimum design condition.
  • the lines Gw+ and Gw ⁇ in FIG. 13 are expressed by following formulae (7) and (8)
  • the groove width, groove depth and the prepit length are set to values based on optimum conditions for preventing the land prepit from affecting the detected RF signal.
  • the wavelength of laser light and the numeral aperture are set to values based on optimum conditions, also. Therefore, it is possible to detect information recorded on the groove and the land prepit with accuracy.

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  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Head (AREA)
US09/419,908 1998-10-23 1999-10-18 Recording medium and a recording system for the recording medium Expired - Lifetime US6181672B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US09/758,393 US6493313B2 (en) 1998-10-23 2001-01-12 Recording medium having grooves and prepits and a recording system for the recording medium
US10/274,199 US6952393B2 (en) 1998-10-23 2002-10-21 Recording medium and a recording system for the recording medium

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10-301965 1998-10-23
JP30196598A JP4372867B2 (ja) 1998-10-23 1998-10-23 光ディスク及び記録再生装置

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US09/758,393 Continuation US6493313B2 (en) 1998-10-23 2001-01-12 Recording medium having grooves and prepits and a recording system for the recording medium

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US09/419,908 Expired - Lifetime US6181672B1 (en) 1998-10-23 1999-10-18 Recording medium and a recording system for the recording medium
US09/758,393 Expired - Fee Related US6493313B2 (en) 1998-10-23 2001-01-12 Recording medium having grooves and prepits and a recording system for the recording medium
US10/274,199 Expired - Lifetime US6952393B2 (en) 1998-10-23 2002-10-21 Recording medium and a recording system for the recording medium

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US09/758,393 Expired - Fee Related US6493313B2 (en) 1998-10-23 2001-01-12 Recording medium having grooves and prepits and a recording system for the recording medium
US10/274,199 Expired - Lifetime US6952393B2 (en) 1998-10-23 2002-10-21 Recording medium and a recording system for the recording medium

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US (3) US6181672B1 (zh)
EP (2) EP0996118B1 (zh)
JP (1) JP4372867B2 (zh)
CN (3) CN100342438C (zh)
DE (2) DE69920368T2 (zh)
HK (2) HK1073527A1 (zh)

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US20030012124A1 (en) * 2001-07-12 2003-01-16 Tdk Corporation Optical recording disc
US6535477B1 (en) * 1999-06-28 2003-03-18 Pioneer Corporation Optical recording medium having groove and land tracks, and method of manufacturing the same
US6665260B2 (en) * 2000-07-07 2003-12-16 Tdk Corporation Optical recording medium including protruding winding parts used as prepits
US6687213B1 (en) * 1999-04-08 2004-02-03 Pioneer Corporation Optical recording medium having pre-formed land-prepits and method for producing same
US6707785B1 (en) * 2000-09-14 2004-03-16 Pioneer Corporation Optically recording medium having differently-shaped pre-pits formed respectively in first and second regions of a record surface, and apparatus for and method of manufacturing the same
US20060067176A1 (en) * 2004-09-08 2006-03-30 Samsung Electronics Co., Ltd. Optical recording apparatus and method for searching data recording locations by controlling tracking level
US20090196136A1 (en) * 2006-05-30 2009-08-06 Pioneer Corporation Recordable type information recording medium, information recording apparatus, and information recording method

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JP4621550B2 (ja) * 2005-06-24 2011-01-26 東芝マイクロエレクトロニクス株式会社 光ディスク装置の誤り訂正装置
JP4600434B2 (ja) * 2007-06-11 2010-12-15 日本ビクター株式会社 光学的情報記録媒体
JP4609781B2 (ja) * 2008-04-30 2011-01-12 日本ビクター株式会社 光学的情報記録媒体
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US6687213B1 (en) * 1999-04-08 2004-02-03 Pioneer Corporation Optical recording medium having pre-formed land-prepits and method for producing same
US7230906B2 (en) 1999-06-28 2007-06-12 Pioneer Corporation Optical recording medium including a divided track with basic portion and extension portion
US6535477B1 (en) * 1999-06-28 2003-03-18 Pioneer Corporation Optical recording medium having groove and land tracks, and method of manufacturing the same
US6785220B2 (en) 1999-06-28 2004-08-31 Pioneer Corporation Optical recording medium having mark and space portions based on frequency band of RF signal
US20040090898A1 (en) * 2000-07-04 2004-05-13 Pioneer Corporation Recording medium and apparatus and method for manufacturing the same
US7177263B2 (en) 2000-07-04 2007-02-13 Pioneer Corporation Recording medium and apparatus and method for manufacturing the same
US6679430B2 (en) 2000-07-04 2004-01-20 Pioneer Corporation Recording medium and apparatus and method for manufacturing the same
US20020023965A1 (en) * 2000-07-04 2002-02-28 Masahiro Kato Recording medium and apparatus and method for manufacturing the same
US6665260B2 (en) * 2000-07-07 2003-12-16 Tdk Corporation Optical recording medium including protruding winding parts used as prepits
US6707785B1 (en) * 2000-09-14 2004-03-16 Pioneer Corporation Optically recording medium having differently-shaped pre-pits formed respectively in first and second regions of a record surface, and apparatus for and method of manufacturing the same
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EP1486958B1 (en) 2009-04-01
JP4372867B2 (ja) 2009-11-25
EP1486958A2 (en) 2004-12-15
HK1081718A1 (en) 2006-05-19
CN1722265A (zh) 2006-01-18
DE69940677D1 (de) 2009-05-14
US6952393B2 (en) 2005-10-04
DE69920368D1 (de) 2004-10-28
CN1252595A (zh) 2000-05-10
US20010002899A1 (en) 2001-06-07
EP0996118A3 (en) 2001-07-25
CN1601629A (zh) 2005-03-30
CN100342438C (zh) 2007-10-10
US20030053406A1 (en) 2003-03-20
EP0996118B1 (en) 2004-09-22
JP2000132868A (ja) 2000-05-12
US6493313B2 (en) 2002-12-10
EP1486958A3 (en) 2005-03-30
DE69920368T2 (de) 2006-02-23
HK1073527A1 (en) 2005-10-07
CN100568357C (zh) 2009-12-09
CN1175405C (zh) 2004-11-10
EP0996118A2 (en) 2000-04-26

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